Apparatus for cooling and hardening wax carbon coatings



Oct. 1, 194 6. N. s. WELK 2,408,498 v APPARATUS FOR COOLING AND HARDENING WAX CARBON COATINGS Filed April 24,' 1944 2 Sheets-Sheet 1 ATTORN EY.

, N. S. WELK Oct. 1, 1946.

APPARATUS FOR COOLING AND HARDENING WAX CARBON COATINGS 2 Sh'eets-Sheet 2 Filed April 24, 1944 UM, mm

INVENTOR.

ATTORNEY.

Patented Oct. 1, 1946 IN G. WAX CARBON COATINGS I I Nelson SlWelk,

' McBee Company,

Athens, Ohio; assignor to The Athens, Qhi'oi a corporation Application April 24, 1944,"SerialNo. 532,524

presses for the applitionand operation of such a press is well known it is not illustrated and described herein. g

It is the principal object of 'my present inventionto; provide such presses with an improvedmeans :to cool the wax carboncoating of the paper sheets-as they are delivered from the print.- ing cylinder in order to, harden the carbon and give-it gloss prior to the final delivery of the sheets from the press.

Qne form which the invention may assume is exemplified in the following description and illustrated by way ofexample inthe accompanyingdrawings; in which:

Fig l is a plan view of the apparatus embodyingthe preferred form of my invention,

Fig.2 is a side view ofthe same.

Fig. 3 is a longitudinal section 3-7-3 of. Fig. 1.

taken on line Fig. 4 is a longitudinalsection taken on line.

Referring more particularly to the accompanying-drawings, lit-indicates a pair of side frames formed as a rigid part of the printing press frame and located at the delivery end of the press. The main frame of the press, of course, carries in the usual manner aprinting cylinder II (shown in dot and dash lines) which operates in the conventional fashion. Extending laterally between the side frames I is a stripper bar I2 carrying stripper fingers I4 so positioned that they will strip the printed sheets from the printing cylinder I I and direct them substantially horizontally rearwardly between the frames I0.

In the present instance the printing is the application of heated wax carbon to one side of a sheet of paper run through the press. When the sheets are delivered from the printin cylinder I I the wax carbon coating will be uppermost so that the under or uncoated side of the sheet will be engaged by the stripper fingers I4.

Arranged rearwardly of the printing cylinder at a spaced distance therefrom is a cooling cylinder I5 having its ends suitably journaled in the side frames ID. To direct the printed sheets over this cooling cylinder I5, a transfer roller I6 and a guide roller I6a are provided intermediate the printing cylinder II and the cooling cylinder I5.

Such

1 Claim. (01. 101-416 The transfer roller'IS is arranged closely adjacent the stripper bar I2 so as to receive the sheets from. the fingers I4. A suitable bridge I! secured at its ends to the side frames is arranged between the transfer roller I6 and the coolingcylinder I5 so as to guide the paper from the transfer roller I6 to the cooling cylinder I5. At'the rear side .of the cooling cylinder I5 is a second stripper bar I8 carrying stripper members I9 so formed as to strip the sheets from the cooling cylinder I5 and direct them onto the top flight of a conveyer 20. This conveyer as illustrated inthe drawings, is composed of .a plurality of: narrow fabric belts spaced apart as shown. These belts are disposed. over a roller ulley 2| journaled in the sidelframes I0 as illustrated.

I'll

' der II will be transferred 20 is 'a roller pulley 22 A plurality of Disposed over the conveyer journaled. in the side frames I0;

spaced string belts 23v are arranged over. this.

roller in parallelism with the top flight of the conveyer -20. The bottom flights of the string belts 23 are spaced'slightly. above the top flight of the conveyer 20 and travel in the same direc-, tion; at the same-speed so. that they will act to hold the paper sheets flatwise =0n the conveyer 20 for delivery at the end of; the conveyer for stack- 111g a y 7. It should be pointed'out that the printing cylinder. II, the transfer roller I5, the cooling cylinder I5; the conveyer roller- 2.|; revolve in the same direction at the proper relative peripheral speeds so that sheets directed from the printing cylinby the transfer roller IE to the cooling cylinder I5 and thence to the .top flight of the conveyer 20 for delivery from the machine. It is obvious, of course, that the string belt roller pulley 22 revolves in a direction opposite from the roller 2| at the same peripheral speed so that the lower flight of the string belts 23 and the upper flight of the conveyer 20 will travel in the same direction at the same rate of speed.

To drive the rollers, as just described, a drive (not shown) is transmitted from the driving mechanism of the press proper to the shaft of the transfer roller IS. A sprocket and chain drive .24 transmits a drive from the shaft of the transfer roller I6 to the shaft of the conveyer roller pulley 2|. Spur gears 25 and 25a on the shaft of the roller I6 and'the shaft of the cooling cylinder I5 effects driving of the latter. Spur gears 26 and 26a effect a drive between the roller pulleys 2| and 22. The shaft of the guide roller Ilia is fitted with a sprocket lfib which engages the chain of the drive 24 to effect driving of that roller.

To cool or chill the cooling cylinder IS, the

times during the operation of the cylinder [6, a,

cooling fluid or liquid may be circulated therethrough.

In order to effect a rapid cooling of the carbonn sheets passing over the roller I5, I have provided means for causing the sheets to be placed in firm contact with the exterior of the peripheral wall of the cylinder l5 during the passage of the sheets thereover. This means comprises a pair of air-conducting tubes2'l arranged parallel to the cylinder I 5 and fixed at their ends to the side frames l0. One end of the tubes are connected to flexible conduits 28 communicating With a source of air under pressure. The tubes 21 are, of course, stationarily fixed in the frame as illustrated.

Each tube 21 is formed with a row of spaced nozzles 29 directed toward the peripheral surface of the cylinder l-5 at the upper side thereof. When air under pressure is directed to the tubes 21 a multiplicity of fine jets or streams of air will emanate from the nozzles 29 and cause the sheet directed between the nozzles and the cylinder I 5 to be pressed in firm contact with the cylinder. The combined effect of the air nozzles and the cooling action of the cylinder is 'suflicient to cause rapid cooling and hardening of the carbon so that it will discharge from the cylinder 15 hardened and with a glossy surface and may be promptly delivered from the machine and stacked.

' In operation of my apparatus, sheets printed in the Kelly cylinder H may be stripped therefrom by the stripper fingers l4 and transferred by the transfer roller l6 and the bridge I! to the upper surface of the cooling cylinder I 5. As the'sheets pass over this cylinder they will be pressed in close contact therewith by the action of the air jets emanating and cooling the carbon on the sheets. After press and delivered by the printing from the nozzles 29 of the tubes 21 This cooling action will result in hardening the sheets pass the nozzles 29 they will be stripped from the cooling cylinder l5 by the stripper members l9 and will be directed flatwise onto the upper flight of the conveyer 20. They will be held in a flat condition by the lower flight of the string belts 23 superposed over the conveyer 20. As the sheets are delivered by the conveyer they are, of course, stacked in the usual fashion and this can be accomplished without smearing or otherwise disturbing the carbon due to the fact 'that it has been cooled and hardened before delivery as previously described,

From the foregoing it is obvious that I have provided a very simple but effective apparatus for cooling and hardening the wax carbon coating of paper sheets as the latter are delivered from the printing cylinder of a press. It should be pointed out that by so hardening the carbon it is given a glossy surface which enhances its appearance.

While I have shown the preferred form of my invention, it is to be understood that various changes may be made therein by those skilled in the art Without departing from the spirit of the invention as defined in the appended claim.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

In combination with a printing'press for printing wax carbon on sheets of'paper, said press including a printing cylinder, a cooling cylinder arranged at a spaced distance from the printing cylinder with its axis parallel thereto and revolving at substantially the same peripheral speed, transfer means between the printing cylinder and the cooling cylinder for-transferring the sheets from the printing cylinder over the cooling cylinder, a plurality of nozzles arranged longitudinally over the cooling cylinder to direct air jets towards the upper surface thereof whereby sheets directed to the cooling cylinder will pass between said jets and said cooling cylinder, a conveyer for receiving sheets from the cooling cylinder and discharging them from the machine, and transfer means between said conveyer and said cooling cylinder for' stripping the sheets from the cooling cylinder and directing them to the conveyer, and string belts overlying the conveyer with their bottom flights spaced over the conveyer to maintain the sheets fiatwise on the conveyer.

NELSON s. WELK. 

